Description

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...a minute, and the tube d is immersed below water, and the stopcock opened. As soon as the water has risen in the tube, the cock is closed, and the shaking is repeated. Water is then admitted again in the same way, care being taken to level the water inside and outside the tube before the cock is closed. The reading on the scale gives the percentage of carbonic acid. If a solution of pyrogallic acid is now introduced, the percentage of oxygen can be determined in the same way. The lime to be used in defecating is first slaked in special tanks furnished with agitators. It is then diluted with sufficient water, carefully strained, and constitutes a milk of lime having a density of 20 to 25 B. Treatment of the Lime Scums.--The scums collected in the lime defecation process contain in the fresh state sugar, numerous nitrogenous matters, and other fertilizing elements. Plicque, working upon scums, analysing Much better value is thus obtained for the scums than by selling them in a crude state at a low price for manuring purposes. The method of treating the green scums to remove their excess of moisture is by the use of filter-presses. The scums of the two carbonations are collected in the same cistern, fitted with two monte-jus. The escape-pipes from these montejus re-unite into one, so that though the monte-jus are used alternately, there is no fluctuation in the supply of scum to the filter-presses. The systems most largely used are those of Trinks, and Durieux et Roettger. Trinks' press, shown in Fig. 137, is composed of a series of cloth bags, held in all parts against metallic plates pierced with holes. The monte-jus forces the dirty liquid into these bags; the juice runs away clear, while each bag fills with the solid scum, which is strongly...show more